DTC P0A94:00 [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))]

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Note

•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION	DC-DC converter (i-ELOOP): control circuit signal error
DETECTION CONDITION	Determination conditions	•  The PCM receives a response signal from the DC-DC converter (i-ELOOP) which differs from the relay operation command voltage of the PCM.
	Preconditions	•  Not applicable
	Drive cycle	•  1
	Self test type	•  CMDTC self test
	Sensor used	•  Not applicable
FAIL-SAFE FUNCTION	•  Inhibits engine-stop by operating the i-stop function. •  Depending on the type of malfunction, any of the following controls may be implemented. ―  Transition to i-ELOOP bypass mode. ―  i-ELOOP bypass mode inhibited.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	•  Flashes i-stop warning light (amber). •  The following vehicle conditions differ depending on the type of malfunction ―  Illuminates the master warning light ―  Illuminates the charging system warning light ―  Each warning indication is displayed on the multi-information display. (With multi-information display)
POSSIBLE CAUSE	•  Connector or terminal malfunction of the following parts: ―  PCM ―  DC-DC converter (i-ELOOP) •  Short to ground in wiring harness between the following terminals: ―  DC-DC converter (i-ELOOP) terminal 1F—PCM terminal 2AK ―  DC-DC converter (i-ELOOP) terminal 1G—PCM terminal 2C •  Open circuit in wiring harness between the following terminals: ―  DC-DC converter (i-ELOOP) terminal 1F—PCM terminal 2AK ―  DC-DC converter (i-ELOOP) terminal 1G—PCM terminal 2C •  DC-DC converter (i-ELOOP) malfunction •  PCM malfunction

System Wiring Diagram

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Function Explanation (DTC Detection Outline)

―  The DC-DC converter (i-ELOOP) is equipped with a bypass circuit which supplies voltage generated by the generator to the 12 V line. If this function does not operate, a power supply shortage occurs.

―  With this diagnosis, a malfunction is determined by the PCM, in which a bypass circuit of the DC-DC converter (i-ELOOP) from the PCM is on or the response signal of the DC-DC converter (i-ELOOP) related to the off command voltage does not match.

―  To stabilize the power supply of the electrical devices when the engine is restarted by i-stop, the DC-DC converter (i-ELOOP) is equipped with a function which disconnects the power supply of the electrical devices from the battery and supplies electricity directly through the DC-DC converter (i-ELOOP). If this function does not operate, the power supply of the electrical devices is turned off instantaneously due to the effect of cranking when the engine is restarted by i-stop.

―  With this diagnosis, a malfunction is determined by the PCM, in which an i-stop relay circuit of the DC-DC converter (i-ELOOP) from the PCM is on or the i-stop relay circuit operation condition of the DC-DC converter (i-ELOOP) related to the off command voltage does not match.

Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

Function Inspection Using M-MDS

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY •  Verify related Service Information availability. •  Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. •  If the vehicle is not repaired, go to the next step.
		No	Go to the next step.
2	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note •  Recording can be facilitated using the screen capture function of the PC. •  Record the snapshot data on the repair order.	—	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

―  Verifying malfunction related to DC-DC converter (i-ELOOP) 1G terminal

―  Verifying malfunction related to DC-DC converter (i-ELOOP) 1F terminal

―  Verifying/replacing malfunctioning part

―  Verify that primary malfunction is resolved and there are no other malfunctions.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Switch the ignition off. •  Disconnect the connector of the following parts. ―  PCM ―  DC-DC converter (i-ELOOP) •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: ―  DC-DC converter (i-ELOOP) terminal 1G •  Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  PCM terminal 2C—DC-DC converter (i-ELOOP) terminal 1G If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to ground. Go to Step 7.
		No	Go to the next step.
2	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Verify that the DC-DC converter (i-ELOOP) and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  PCM terminal 2C—DC-DC converter (i-ELOOP) terminal 1G •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  PCM terminal 2C—DC-DC converter (i-ELOOP) terminal 1G If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 7.
3	PURPOSE: VERIFY IF SHORT TO GROUND IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Verify that the DC-DC converter (i-ELOOP) and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: ―  DC-DC converter (i-ELOOP) terminal 1F •  Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  PCM terminal 2AK—DC-DC converter (i-ELOOP) terminal 1F If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to ground. Go to Step 7.
		No	Go to the next step.
4	PURPOSE: VERIFY IF OPEN CIRCUIT IN EACH WIRING HARNESS AFFECTS DIAGNOSTIC RESULTS •  Verify that the DC-DC converter (i-ELOOP) and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  PCM terminal 2AK—DC-DC converter (i-ELOOP) terminal 1F •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: •  PCM terminal 2AK—DC-DC converter (i-ELOOP) terminal 1F If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 7.
5	PURPOSE: VERIFY IF MALFUNCTION OCCURRING IS CAUSED BY WIRING HARNESS/CONNECTOR LOSS •  Have all the wiring harnesses/connectors which can be considered the cause of DTC P0A94:00 been inspected?	Yes	Go to the next step.
		No	Inspect all the related wiring harnesses/connectors. If there is a malfunction •  Repair or replace the connector and/or terminals, then go to Step 7. If there is no malfunction •  Go to the next step.
6	PURPOSE: VERIFY DC-DC CONVERTER (i-ELOOP) REPLACEMENT RECORD •  Is the DC-DC converter (i-ELOOP) being replaced within the troubleshooting diagnostic procedure this time?	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)].) Go to the next step.
		No	Replace the DC-DC converter (i-ELOOP). (See DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].) Go to the next step.
7	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION •  Always reconnect all disconnected connectors. •  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].) •  Implement the repeatability verification procedure. (See Function Inspection Using M-MDS.) •  Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].) •  Is the same Pending DTC present?	Yes	Repeat the inspection from Step 5.
		No	Go to the next step.
8	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION •  Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))].)
		No	DTC troubleshooting completed.